Title: Rafael Coll,
1Basic Electrical Safety
Rafael Coll, Environment Safety and Health
Section Health Safety Group Ext. 8518 Pager
(630) 266-6103
2Basic Electrical Safety
? Course not designed to teach you to work on
electrical equipment.
? You will not be qualified to work
on electrical equipment.
? If you spot problems with electrical equipment
you should report it to your supervisor.
3Objectives
- Be familiar with the fundamental concepts of
electricity.
- Be familiar with the effects of electricity on
the human body.
- Be able to recognize common electrical
- hazards.
4Objectives
- Be familiar with electrical protective devices.
5Fundamentals of Electrical Hazards
- To flow electricity must have a complete path.
- Electricity flows through conductors
- water, metal, the human body
- Insulators are non-conductors
- The human body is a conductor.
6Fundamentals of Electrical Hazards
Have You Ever Been Shocked?
THE BASICS
7Fundamentals of Electrical Hazards
? More than 3 ma painful shock ? More than 10
ma muscle contraction no-let-go danger ? More
than 30 ma lung paralysis- usually
temporary ? More than 50 ma possible ventricular
fib. (heart dysfunction, usually fatal) ? 100 ma
to 4 amps certain ventricular fibrillation,
fatal ? Over 4 amps heart paralysis severe
burns. Usually caused by gt600 volts
8Fundamentals of Electrical Hazards
- Hazards of Electricity
- Electrocution/Shock/Burns/Death
- Minimum distance from overhead lines 10 ft.
- Inspect all electrical tools and equipment
- Frayed, cut, broken wires
- grounding prong missing
- Improper use of cube taps
- improperly applied or missing strain relief
9Electrical Protection
- Circuit Breakers
- Provided to protect EQUIPMENT not people
- Do not reset breakers with a line voltage higher
than 120V and only reset if you know why it
tripped
- GFCIs
- - Provided to protect people
- - Trip range 4-6ma
- - Monthly test
10Electrical Protection
- Distance
- If you sense the presence of an electrical hazard
or exposed conductors that may be energized, keep
your distance and STAY AWAY
11Terminology
12Electrical Grounding
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17Fundamentals of Electrical Hazards
- Voltage
- electrical pressure (water pressure)
- Amperage
- electrical flow rate (gallons/min)
- Impedance
- restriction to electrical flow (pipe friction)
18Fundamentals of Electrical Hazards
- Circuit
- path of flow of electricity
- Circuit Element
- objects which are part of a circuit and
- through which current flows.
- Fault
- current flow through an unintended path.
19Fundamentals of Electrical Hazards
- What is Grounding?
- Protection from electric shock
- normally a secondary protection measure
- A ground is a conductive connection
- between electrical circuit or equipment and earth
or ground plane - creates a low resistance to the earth.
20Basic Rules of Electrical Action
- Electricity isnt live until current flows
- Electrical current wont flow until there is a
complete loop, out from and back to the power
source.
21Preventing Accidental Electrical Contact
Electrocution
Prevention
Path
Electricity
Keep Away
Ground
Time
GFCI
22Dos and Don'ts
- Do plug power equipment into wall receptacles
with power switches in the Off position. - Do unplug electrical equipment by grasping the
plug and pulling. Do not pull or jerk the cord to
unplug the equipment. - Do not drape power cords over hot pipes,
radiators or sharp objects.
23Dos and Don'ts
- Do check the receptacle for missing or damaged
parts. - Do not plug equipment into defective receptacles.
- Do check for frayed, cracked, or exposed wiring
on equipment cords.
24Dos and Don'ts
- Do check for defective cords clamps at locations
where the power cord enters the equipment or the
attachment plug. - Extension cords should not be used in office
areas. Generally, extension cords should be
limited to use by maintenance personnel
25Dos and Don'ts
- Cheater plugs, extension cords with junction
box receptacle ends or other jury-rigged
equipment should not be used.
26Dos and Don'ts
- Consumer electrical equipment or appliances
should not be used if not properly grounded.
(Look for the UL Label)
27Dos and Don'ts
- Employees should know the location of electrical
circuit breaker panels that control equipment and
lighting in their respective areas. Circuits and
equipment disconnects must be identified
28Dos and Don'ts
- Temporary or permanent storage of any materials
must not be allowed within 3 feet of any
electrical panel or electrical equipment. - Any electrical equipment causing shocks or with
high leakage potential must be tagged with a
Danger tag or equivalent.
29Myths and Misconceptions
- Electricity takes the path of least resistance.
- Electricity wants to go to ground.
- If an electric tools falls into a sink or tub of
water, the item will short out.
30Myths and Misconceptions
- AC reverse polarity is not hazardous.
- It takes high voltage to kill 120 volts is not
dangerous. - Double insulated power tools are doubly safe and
can be used in wet and damp locations.
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